The scientific theory that describes the early development of the Universe.
A type of stored energy. It is taken in when chemical bonds break, and given out when chemical bonds are made.
A ball of icy rock that follows an elliptical orbit around the Sun.
A material which allows charge to move easily through it.
The spreading out and transfer of energy stores into less useful forms, such as thermal energy causing the surroundings to heat up. Dissipated energy is often referred to as 'wasted' energy, since it is not transferred to a useful output.
The process of energy being transferred, or lost, to the surroundings.
elastic potential energy弹性势能
Energy stored in squashed, stretched or twisted materials.
Energy transferred by an electric current.
Energy is 'given-out' by the material and the internal energy of the material will decrease. For example, infrared radiation from the Sun is emitted into space.
energy能源
The capacity for doing work.
The different ways in which energy can be stored, including chemical, kinetic, gravitational potential, elastic potential and thermal stores.
The different ways in which energy can be transferred from one store to another includes heating, by waves, electric current or by a force moving an object.
A force that opposes or prevents movement and converts kinetic energy into heat.
gravitational potential energy重力势能
The energy stored by an object lifted up against the force of gravity. Also known as GPE.
The total kinetic energy and potential energy of the particles in an object.
Energy which an object possesses by being in motion.
A lubricant is anything which reduces the friction between two surfaces.
A collection of two or more atoms held together by chemical bonds.
The potential difference (or voltage) of a supply is a measure of the energy given to the charge carriers in a circuit. Units = volts (V). This is the voltage between two points that makes an electric current flow between them.
Energy transferred as a wavespreading out from a source- eg light, infrared, sound.
An object or group of objects.
When something is moved from one place to another. This may be people, objects or energy.
Van de Graaff generator范德格拉夫发电机
A machine that causes friction between a rubber belt and plastic rollers in order to build up electrical charge on a metal dome. A large potential difference is generated.
vibrations振动
Repeated movements back and forth (about a fixed point).
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